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  2. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    The 37.5 mm length is not derived by a certain scale ratio. While HO scale is a 1:87 scale (3.5 mm to 1 foot), resulting in a 16.5 mm ( 0.65 in) gauge from real life prototype 1,435 mm ( 4 ft 81⁄2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.

  3. Track gauge in the United States - Wikipedia

    en.wikipedia.org/wiki/Track_gauge_in_the_United...

    Track gauge. Originally, various track gauges were used in the United States. Some railways, primarily in the northeast, used standard gauge of 4 ft 8⁄ in ( 1,435 mm ); others used gauges ranging from 2 ft ( 610 mm) to 6 ft ( 1,829 mm ). As a general rule, southern railroads were built to one or another broad gauge, mostly 5 ft ( 1,524 mm ...

  4. LMS 3-Cylindered Stanier 2-6-4T - Wikipedia

    en.wikipedia.org/.../LMS_3-Cylindered_Stanier_2-6-4T

    The LMS Stanier Class 4P 3-Cylinder 2-6-4T is a class of steam locomotives designed for work over the London, Tilbury and Southend Railway route. All 37 were built in 1934 at Derby Works and were numbered 2500–2536. The third cylinder was provided to allow increased acceleration between the many stops on the L.T.&S.R. line.

  5. Friedmann–Lemaître–Robertson–Walker metric - Wikipedia

    en.wikipedia.org/wiki/Friedmann–Lemaître...

    Astronomy portal. v. t. e. The Friedmann–Lemaître–Robertson–Walker metric ( FLRW; / ˈfriːdmən ləˈmɛtrə ... /) is a metric based on an exact solution of the Einstein field equations of general relativity. The metric describes a homogeneous, isotropic, expanding (or otherwise, contracting) universe that is path-connected, but not ...

  6. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    Checking tire pressure with a spring and piston tire-pressure gauge. Pressure measurement is the measurement of an applied force by a fluid ( liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum.

  7. No one knows what Dallas is doing, but it’s provocative - AOL

    www.aol.com/sports/four-verts-no-one-knows...

    As every training camp kicks off across the league, Charles McDonald ponders Dallas' plans, celebrates a great negotiating tactic, and praises the NFC South. No really!

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